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eigen/test/reshape.cpp
Gael Guennebaud 3d200257d7 Add support for automatic-size deduction in reshaped, e.g.: 
mat.reshaped(4,AutoSize); <-> mat.reshaped(4,mat.size()/4);
2017-02-21 15:57:25 +01:00

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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2017 Gael Guennebaud <gael.guennebaud@inria.fr>
// Copyright (C) 2014 yoco <peter.xiau@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include "main.h"
template<typename T1,typename T2>
typename internal::enable_if<internal::is_same<T1,T2>::value,bool>::type
is_same_eq(const T1& a, const T2& b)
{
return (a.array() == b.array()).all();
}
template <typename MatType,typename OrderType>
void check_auto_reshape4x4(MatType m,OrderType order)
{
internal::VariableAndFixedInt<MatType::SizeAtCompileTime==Dynamic?-1: 1> v1( 1);
internal::VariableAndFixedInt<MatType::SizeAtCompileTime==Dynamic?-1: 2> v2( 2);
internal::VariableAndFixedInt<MatType::SizeAtCompileTime==Dynamic?-1: 4> v4( 4);
internal::VariableAndFixedInt<MatType::SizeAtCompileTime==Dynamic?-1: 8> v8( 8);
internal::VariableAndFixedInt<MatType::SizeAtCompileTime==Dynamic?-1:16> v16(16);
VERIFY(is_same_eq(m.reshaped( 1, AutoSize, order), m.reshaped( 1, 16, order)));
VERIFY(is_same_eq(m.reshaped(AutoSize, 16, order), m.reshaped( 1, 16, order)));
VERIFY(is_same_eq(m.reshaped( 2, AutoSize, order), m.reshaped( 2, 8, order)));
VERIFY(is_same_eq(m.reshaped(AutoSize, 8, order), m.reshaped( 2, 8, order)));
VERIFY(is_same_eq(m.reshaped( 4, AutoSize, order), m.reshaped( 4, 4, order)));
VERIFY(is_same_eq(m.reshaped(AutoSize, 4, order), m.reshaped( 4, 4, order)));
VERIFY(is_same_eq(m.reshaped( 8, AutoSize, order), m.reshaped( 8, 2, order)));
VERIFY(is_same_eq(m.reshaped(AutoSize, 2, order), m.reshaped( 8, 2, order)));
VERIFY(is_same_eq(m.reshaped(16, AutoSize, order), m.reshaped(16, 1, order)));
VERIFY(is_same_eq(m.reshaped(AutoSize, 1, order), m.reshaped(16, 1, order)));
VERIFY(is_same_eq(m.reshaped(fix< 1>, AutoSize, order), m.reshaped(fix< 1>, v16, order)));
VERIFY(is_same_eq(m.reshaped(AutoSize, fix<16>, order), m.reshaped( v1, fix<16>, order)));
VERIFY(is_same_eq(m.reshaped(fix< 2>, AutoSize, order), m.reshaped(fix< 2>, v8, order)));
VERIFY(is_same_eq(m.reshaped(AutoSize, fix< 8>, order), m.reshaped( v2, fix< 8>, order)));
VERIFY(is_same_eq(m.reshaped(fix< 4>, AutoSize, order), m.reshaped(fix< 4>, v4, order)));
VERIFY(is_same_eq(m.reshaped(AutoSize, fix< 4>, order), m.reshaped( v4, fix< 4>, order)));
VERIFY(is_same_eq(m.reshaped(fix< 8>, AutoSize, order), m.reshaped(fix< 8>, v2, order)));
VERIFY(is_same_eq(m.reshaped(AutoSize, fix< 2>, order), m.reshaped( v8, fix< 2>, order)));
VERIFY(is_same_eq(m.reshaped(fix<16>, AutoSize, order), m.reshaped(fix<16>, v1, order)));
VERIFY(is_same_eq(m.reshaped(AutoSize, fix< 1>, order), m.reshaped(v16, fix< 1>, order)));
}
// just test a 4x4 matrix, enumerate all combination manually
template <typename MatType>
void reshape4x4(MatType m)
{
internal::VariableAndFixedInt<MatType::SizeAtCompileTime==Dynamic?-1: 1> v1( 1);
internal::VariableAndFixedInt<MatType::SizeAtCompileTime==Dynamic?-1: 2> v2( 2);
internal::VariableAndFixedInt<MatType::SizeAtCompileTime==Dynamic?-1: 4> v4( 4);
internal::VariableAndFixedInt<MatType::SizeAtCompileTime==Dynamic?-1: 8> v8( 8);
internal::VariableAndFixedInt<MatType::SizeAtCompileTime==Dynamic?-1:16> v16(16);
if((MatType::Flags&RowMajorBit)==0)
{
typedef Map<MatrixXi> MapMat;
// dynamic
VERIFY_IS_EQUAL((m.reshaped( 1, 16)), MapMat(m.data(), 1, 16));
VERIFY_IS_EQUAL((m.reshaped( 2, 8)), MapMat(m.data(), 2, 8));
VERIFY_IS_EQUAL((m.reshaped( 4, 4)), MapMat(m.data(), 4, 4));
VERIFY_IS_EQUAL((m.reshaped( 8, 2)), MapMat(m.data(), 8, 2));
VERIFY_IS_EQUAL((m.reshaped(16, 1)), MapMat(m.data(), 16, 1));
// static
VERIFY_IS_EQUAL(m.reshaped(fix< 1>, fix<16>), MapMat(m.data(), 1, 16));
VERIFY_IS_EQUAL(m.reshaped(fix< 2>, fix< 8>), MapMat(m.data(), 2, 8));
VERIFY_IS_EQUAL(m.reshaped(fix< 4>, fix< 4>), MapMat(m.data(), 4, 4));
VERIFY_IS_EQUAL(m.reshaped(fix< 8>, fix< 2>), MapMat(m.data(), 8, 2));
VERIFY_IS_EQUAL(m.reshaped(fix<16>, fix< 1>), MapMat(m.data(), 16, 1));
// reshape chain
VERIFY_IS_EQUAL(
(m
.reshaped( 1, 16)
.reshaped(fix< 2>,fix< 8>)
.reshaped(16, 1)
.reshaped(fix< 8>,fix< 2>)
.reshaped( 2, 8)
.reshaped(fix< 1>,fix<16>)
.reshaped( 4, 4)
.reshaped(fix<16>,fix< 1>)
.reshaped( 8, 2)
.reshaped(fix< 4>,fix< 4>)
),
MapMat(m.data(), 4, 4)
);
}
VERIFY(is_same_eq(m.reshaped( 1, AutoSize), m.reshaped( 1, 16)));
VERIFY(is_same_eq(m.reshaped(AutoSize, 16), m.reshaped( 1, 16)));
VERIFY(is_same_eq(m.reshaped( 2, AutoSize), m.reshaped( 2, 8)));
VERIFY(is_same_eq(m.reshaped(AutoSize, 8), m.reshaped( 2, 8)));
VERIFY(is_same_eq(m.reshaped( 4, AutoSize), m.reshaped( 4, 4)));
VERIFY(is_same_eq(m.reshaped(AutoSize, 4), m.reshaped( 4, 4)));
VERIFY(is_same_eq(m.reshaped( 8, AutoSize), m.reshaped( 8, 2)));
VERIFY(is_same_eq(m.reshaped(AutoSize, 2), m.reshaped( 8, 2)));
VERIFY(is_same_eq(m.reshaped(16, AutoSize), m.reshaped(16, 1)));
VERIFY(is_same_eq(m.reshaped(AutoSize, 1), m.reshaped(16, 1)));
VERIFY(is_same_eq(m.reshaped(fix< 1>, AutoSize), m.reshaped(fix< 1>, v16)));
VERIFY(is_same_eq(m.reshaped(AutoSize, fix<16>), m.reshaped( v1, fix<16>)));
VERIFY(is_same_eq(m.reshaped(fix< 2>, AutoSize), m.reshaped(fix< 2>, v8)));
VERIFY(is_same_eq(m.reshaped(AutoSize, fix< 8>), m.reshaped( v2, fix< 8>)));
VERIFY(is_same_eq(m.reshaped(fix< 4>, AutoSize), m.reshaped(fix< 4>, v4)));
VERIFY(is_same_eq(m.reshaped(AutoSize, fix< 4>), m.reshaped( v4, fix< 4>)));
VERIFY(is_same_eq(m.reshaped(fix< 8>, AutoSize), m.reshaped(fix< 8>, v2)));
VERIFY(is_same_eq(m.reshaped(AutoSize, fix< 2>), m.reshaped( v8, fix< 2>)));
VERIFY(is_same_eq(m.reshaped(fix<16>, AutoSize), m.reshaped(fix<16>, v1)));
VERIFY(is_same_eq(m.reshaped(AutoSize, fix< 1>), m.reshaped(v16, fix< 1>)));
check_auto_reshape4x4(m,ColOrder);
check_auto_reshape4x4(m,RowOrder);
check_auto_reshape4x4(m,AutoOrder);
check_auto_reshape4x4(m.transpose(),ColOrder);
check_auto_reshape4x4(m.transpose(),RowOrder);
check_auto_reshape4x4(m.transpose(),AutoOrder);
VERIFY_IS_EQUAL(m.reshaped( 1, 16).data(), m.data());
VERIFY_IS_EQUAL(m.reshaped( 1, 16).innerStride(), 1);
VERIFY_IS_EQUAL(m.reshaped( 2, 8).data(), m.data());
VERIFY_IS_EQUAL(m.reshaped( 2, 8).innerStride(), 1);
VERIFY_IS_EQUAL(m.reshaped( 2, 8).outerStride(), 2);
if((MatType::Flags&RowMajorBit)==0)
{
VERIFY_IS_EQUAL(m.reshaped(2,8,ColOrder),m.reshaped(2,8));
VERIFY_IS_EQUAL(m.reshaped(2,8,ColOrder),m.reshaped(2,8,AutoOrder));
VERIFY_IS_EQUAL(m.transpose().reshaped(2,8,RowOrder),m.transpose().reshaped(2,8,AutoOrder));
}
else
{
VERIFY_IS_EQUAL(m.reshaped(2,8,ColOrder),m.reshaped(2,8));
VERIFY_IS_EQUAL(m.reshaped(2,8,RowOrder),m.reshaped(2,8,AutoOrder));
VERIFY_IS_EQUAL(m.transpose().reshaped(2,8,ColOrder),m.transpose().reshaped(2,8,AutoOrder));
VERIFY_IS_EQUAL(m.transpose().reshaped(2,8),m.transpose().reshaped(2,8,AutoOrder));
}
MatrixXi m28r1 = m.reshaped(2,8,RowOrder);
MatrixXi m28r2 = m.transpose().reshaped(8,2,ColOrder).transpose();
VERIFY_IS_EQUAL( m28r1, m28r2);
using placeholders::all;
VERIFY(is_same_eq(m.reshaped(v16,fix<1>), m(all)));
VERIFY_IS_EQUAL(m.reshaped(16,1), m(all));
VERIFY_IS_EQUAL(m.reshaped(1,16), m(all).transpose());
VERIFY_IS_EQUAL(m(all).reshaped(2,8), m.reshaped(2,8));
VERIFY_IS_EQUAL(m(all).reshaped(4,4), m.reshaped(4,4));
VERIFY_IS_EQUAL(m(all).reshaped(8,2), m.reshaped(8,2));
VERIFY(is_same_eq(m.reshaped(AutoSize,fix<1>), m(all)));
VERIFY_IS_EQUAL(m.reshaped(fix<1>,AutoSize,RowOrder), m.transpose()(all).transpose());
}
void test_reshape()
{
typedef Matrix<int,Dynamic,Dynamic> RowMatrixXi;
typedef Matrix<int,4,4> RowMatrix4i;
MatrixXi mx = MatrixXi::Random(4, 4);
Matrix4i m4 = Matrix4i::Random(4, 4);
RowMatrixXi rmx = RowMatrixXi::Random(4, 4);
RowMatrix4i rm4 = RowMatrix4i::Random(4, 4);
// test dynamic-size matrix
CALL_SUBTEST(reshape4x4(mx));
// test static-size matrix
CALL_SUBTEST(reshape4x4(m4));
// test dynamic-size const matrix
CALL_SUBTEST(reshape4x4(static_cast<const MatrixXi>(mx)));
// test static-size const matrix
CALL_SUBTEST(reshape4x4(static_cast<const Matrix4i>(m4)));
CALL_SUBTEST(reshape4x4(rmx));
CALL_SUBTEST(reshape4x4(rm4));
}
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